Satellite cooler for a rotary kiln

ABSTRACT

Satellite cooler which includes a plurality of cooling tubes distributable uniformly about the periphery of a rotary kiln at the material outlet end thereof, the cooling tubes being formed with respective material inlet openings connectible by respective tubular connecting chutes to respective material discharge openings formed in the casing of the rotary kiln, the material discharge openings being offset in rotary direction of the kiln relative to the respective material inlet openings of the cooling tubes, each of the cooling tubes having a respective inlet end severed obliquely to the axis of the respective cooling tube so that the severing plane extends substantially vertically when the respective material discharge opening in the rotary kiln casing has attained substantially its lowest position beneath the rotary kiln axis and an end plate disposed in the severing plane and closing the cooling tube, the material inlet opening being formed in the end plate.

= United States Patent 1191 Deussner 1' SATELLITE COOLER FOR A ROTARY KILN [75] Inventor: Herbert Deussner, Bensberg-Refrath, Germany [73] Assignee: Klockner-Humboldt-Deutz Aktiengesellschaft, K0111; Germany 22 Filedi Dec. 15, 1972 {2l] Appl. No.: 315,557

301 Foreign Application Priority Data Dec. 15, 1971 Germany 2162236! 1521" U.s c1 132/ 0, 432/117, 432/115 [51] Int. F27b 7/00 [58] Field of Search; 432/103-106,

' 6]v References Cited UNITED STATES PATENTS 828,555 8/1906 Krottnaurer 432/117 2,003,538 6/1935 Hickey 285/183 2,463,593 3/1949 Boardman.... 285/183 2,904,322 9/1959 Bruffm; 432/117 3,279,775 10/1966 Roubal. 432/80 3,372,915 3/1968 Jensen..... 432/117 3,556,495 1/1971 Jensen 432/117 Aug. 13, 1974 "3,643,933 2/1972 McDonald ..432/s0 FOREIGN PATENTS OR APPLICATIONS 645,407 5/1937 Germany 285/l83 Primary Examiner-John .1. Camby Assistant 'ExaminerHenry C. Yuen Attorney, Agent, or Firm Herbert- L. Lerner [5 7] ABSTRACT Satellite cooler which includes a plurality of cooling tubesdistributable uniformly about the periphery of a rotary kiln-at the material outlet end thereof, the cooling tubes being formed with respective material inlet openings connectible by respective tubular connecting chutes to respective material discharge openings formed in the casing of the rotary kiln, the material fdischarge openings being offset in rotary direction of the kiln relative to the respective material inlet openings of the cooling tubes, each of the cooling tubes 1 having a respective inlet end severed obliquely to the axis of the respective cooling tube so that the severing 1 plane extends substantially vertically when the respective material discharge opening in the rotary kiln casing has attained substantially its lowest position beneath the rotary kiln axis and an end plate disposed in the severing plane and closing the cooling tube, the material inlet opening being formed in the end plate.

12 Claims, 4 Drawing Figures PAIENIED 3.829.282

sum 2 or 3 FIG. 2

SATELLITE COOLER FOR A ROTARY KILN The invention relates to a satellite cooler, and, more particulary, to such a satellite cooler having several cooling tubes located at the material-discharging end of a rotary kiln uniformly distributed about the periphery of a kiln, the cooling tubes being formed with material inlet openings connected by a tubular connecting chute with respective material drop-out or discharge openings formed in the casing of the rotary kiln, the material discharge openings being offset in rotary direction of the kiln relative to the respective material inlet openings of the cooling tubes.

From German Pat. No. 261,674, a satellite cooler is known wherein the material outlet openings in the rotary kiln casing are offset or shifted in the direction of rotation, relative to the respective material inlet openings of the cooling tubes, the respective connecting tube between material discharge opening and material inlet opening terminating substantially tangentially laterally in the respective cooling tube. This construction of the prior art is supposed to prevent the material, that has been supplied to the kiln and has already entered a cooling tube, from partly falling back into the kiln during the upward movement of the cooling tube. Such a tangential inlet, of necessity, requires, at least in the inlet region, a conveyor coil or screw in the interior of the cooling tube, with the aid of which during the upward movement of the cooling tube, the material present in the inlet end of the cooling tube is transported in axial direction to the discharge end of the cooling tube. Such built-in devices have a short service life due to great wear and tear and high thermal stress in the inlet region of the cooling tube.

It is an object of the invention to provide an improved satellite cooler for rotary kilns which avoids the foregoing disadvantage of the heretofore known coolers of this general type. With the foregoing and other objects in view, there is provided, in accordance with the invention, satellite cooler comprising a plurality of cooling tubes distributable uniformly about the periphery of a rotary kiln at the material outlet end thereof, the cooling tubes being formed with respective material inlet openings connectible by respective tubular connecting chutes to respective material discharge openings formed in the casing of the rotary kiln, the material discharge openings being offset in rotary direction of the kiln relative to the respective material inlet openings of the cooling tubes, each of the cooling tubes having a respective inlet end severed obliquely to the axis of the respective cooling tube so that the severing plane extends substantially vertically when the respective material discharge opening in the rotary kiln casing has attained substantially its lowest position beneath the rotary kiln axis and an end plate disposed in the severing plane and closing the cooling tube, the material inlet opening being formed in the end plate. With this construction of the inlet end of each cooling tube, additional conveyor or transport installations built into the cooling tube interior are superfluous, because the conveyance of the material situated in the inlet end of the cooling tube away in axial direction is assumed by the end plate in cooperation with the rotational movement of the kiln.

ln accordancewith another feature of the invention, each material inlet opening is disposed, with respect to the axis of the rotary kiln,-substantially in a half of the respective end plate which is located more distant than the other half thereof from the rotary kiln casing wall.

This construction according to the invention has the effect that the hot kiln material enters the cooling tube, in the vicinity of the cooling tube wall, and that during continuous upward movement and the rotation of the cooling tube effected thereby, the edge of the material inlet opening is located above the surface of the material situated in the cooling tube, before the tubular connecting chute proceeds horizontally relative to the rotating cylindrical furnace. In this manner, the material which is already present in the cooling tube is prevented from returning into the kiln.

in accordance with a further feature of the invention, the severing plane in which the end plate is disposed has an angle of inclination B of from 30 to with respect to the longitudinal axis of the cooling tube. Such an inclination or slope assures a good transport or conveyance action of the end plate for the material received in the cooling tube.

in accordance with a preferred embodiment of the invention, each of the cooling tubes in the region of the inlet end thereof, has a bent or kinked construction in direction toward the respective material discharge opening of the rotary kiln, the location of the kink being in an imaginary plane which, as well as the plane wherein the end plate is disposed, extends substantially in vertical direction when the respective material discharge, opening in the rotary kiln casing has reached the substantially lowest position thereof beneath the rotary kiln axis. With such a construction, an additional transport or conveying action is provided by the kinked part of the cooling tube wall, because this wall portion actions like a slide or chute kiln material which has actually run into the cooling tube, and thus exerts a strong conveying action in axial direction upon the material. At the same time, a considerable portion of the material directly located in the inlet region is carried away in axial direction before the strong conveying action of the flat end plate has any effect upon the material which is instituted approximately at that instant when the respective cooling tube is located above the kiln axis and which is still maintained during the downward movement. The particular advantage of this construction is primarily that at that instant when the respective cooling tube, during the downward movement thereof, reaches a position at which the feeding of material from the interior of the kiln is commenced, the inlet end is largely freed of the quantity of material from the previous feeding phase of the material. Consequently, the material or any part thereof is reliably prevented from dropping back into the kiln during the subsequent upward movement because, due to the virtually complete emptying of the inlet end during the upward movement, at the newly instituted feeding phase, all of the material present in the connecting chute can be completely accommodated by the inlet end and, thus, the respective connecting chute is completely emptied into the cooling tube coordinated therewith.

In accordance with'an added feature of the invention, in the preferred embodiment thereof, the kink or bend is formed by a part of the respective cooling tube and comprises an end of the tube severed obliquely to the axis of the tube, the end plate being located at the end of the tube and extending perpendicularly to the original axis of the tube, the severed tube end being rotated through an angle of and firmly reconnected at the severed surface thereof to the corresponding severed surface of the remainder of the cooling tube. This construction provides considerable advantages in the production of a cooling tube with a kinked or bent inlet end. The cooling tube end thereby includes initially, an end plate running vertically to the axis of the cooling tube and closed by the end plate. Thus, it represents a circular surface. Because the part forming the kink or bend is severed obliquely from the originally straight cooling tube end, a developed projection can be dispensed with, because the section running obliquely to the axis of the cooling tube automatically produces two mutually coordinated contours of the cooling tube casing or jacket which, after a rotation through an angle of 180, can be firmly welded together.

In accordance with a concomitant feature of the invention, the respective tubular connecting chutes, at the end thereof connecting with the respective cooling tube, extend substantially perpendicularly to the plane of the end plate 1. By means of this construction, an especially advantageous flow of material and a complete emptying of the connecting chute during the upward movement of the respective cooling tube are assured.

In accordance with yet another feature of the invention, the material inlet opening has a center which is pivoted in a vertical plane through an angle a of between land 45 counterclockwise about the axis of the respective cooling tube and with respect to a plane which is determined by or in which both the axis of the rotary kiln and the axis of the respective cooling tube are disposed. By this construction, at the-onset of the material inlet phase, the material coming from the kiln is already located to a great extent within the respective cooling tube, before the material which is already received in the cooling tube and forms a slope or embankment on the cooling tube wall, due to the rotation of the kiln, intersects the cross-section of the material inlet opening. Damming or stagnation in the vicinity of the material inlet opening during the feeding phase is thereby largely prevented.

Although the invention is illustrated and described herein as satellite cooler for a rotary kiln, it is nevertheless not intended to be limited to the details shown, since various modifications may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.

The invention, however, together with additional objects and advantages thereof, will be best understood from the following description when read in connection with the accompanying drawing, in which:

FIG. 1 is a longitudinal view partly in section of part of a rotary kiln having a satellite cooler constructed in accordance with the invention;

FIG. 2 is an enlarged fragmentary cross-sectional view of FIG. 1 taken along the line II-Il in the direction of the arrows and presenting an end view of a cooling tube in the lowest position thereof;

FIG. 3 is a further'enlarged cross-sectional view of FIG. 2 taken along the line IIIIII in the direction of the arrows, wherein the viewer faces the inlet end of a cooling tube; and

FIG. 4 is a cross-sectional view of FIG. 3 taken along the line IV-IV in the direction of the arrows.

Referring now to the drawings and first, particularly to FIG. 1 thereof, there is shown therein the discharge end of a rotary kiln. Aplurality of cooling tubes 1 are distributed uniformly about the periphery of the kiln tube 2. The cooling tubes 1 are firmly connected, on the one hand, by tubular connecting chutes 3, and, on the other hand, by retaining bars 4, to the kiln tube or casing 2 or to a tubular elongation 5 of the kiln tube 2. The connecting chute 3 leading to each cooling tube 1 is connected to the kiln heating chamber by a respective material discharge opening 6. The end of each cooling tube facing away from the connecting chutes terminates in a discharge or drop-out casing 7, which accumulates the quantity of material dropping out of or discharging from the cooling tubes and conducts it to a non-illustrated conveyor device disposed below the discharge casing 7.

In the tubular extension 5 of the rotary kiln, a stationary platform 8 is disposed, whereon a burner device 9 V for the rotary kiln can travel. The combustion chamber of the kiln is tightly sealed off from the tubular extension 5 by a door 10.

The connecting chutes 3, in the preferred embodiment of the invention, have a construction wherein, from the location at which they are connected to the rotary kiln, they extend initially in radial direction and then are either repeatedly kinked or folded or are continuously bent or curved and terminate in and substantially perpendicularly to an end 'plate 11 located at the end of therespective cooler tube 1. The closure wall, or end plate 11, which extends at an inclination to the axis of the respective cooler tube 1, in accordance with the invention thus permits, on the one hand, this particular form of the connecting chute 3, which is advantageous for the flow of material from the kiln and permits, on the other hand, that the material discharge opening 6 of the rotary kiln for a respective cooler tube 1 is offset in rotary direction of the kiln (arrow 12 as viewed in FIG. 2) with respect to the material inlet opening 15, i.e., it is arranged in leading position.

As is readily apparent in FIGS. 1 and 2, the respective material inlet opening 15 is located, relative to the axis of the rotary kiln, in that half of the end plate 11 that is of greater distance from the wall or tube 2 of the rotary kiln. A particularly, advantageous disposition of the material inlet opening 15 is described in greater detail hereinbelow.

As the views of the preferred embodiment in FIGS. 2 and 3 disclose, the cooling tube 1, in the vicinity of the inlet end thereof, has a kinked or bent construction in direction toward the respective material discharge opening 6, both the imaginary plane 13 of the location of the kink as well as the plane of the end plate 11 extend substantially vertically (as viewed in FIGS. 1 and 2) when the respective discharge opening 6 formed in the casing of the rotary kiln, has attained substantially the lowest position thereof below the axis of the rotary kiln. The kink is formed so that the plane of reference of the end plate 11 is disposed at an angle B (FIG. 3) between 30 and with respect to the cooling tube axis 17. In the illustrated embodiment, as shown in FIG. 3, the angle ,8 is 45.

The kink is appropriately made so, that starting from a straight cooling tube with an end plane that extends perpendicularly to the axis of the tube, a part 14 shown in dotted lines in FIG. 3 is severed obliquely to the axis of the tube from an end of the tube which is the inlet end thereof and, offers a rotation of about the cooling tube axis in the vicinity of the severing plane,

- tion through 180 can be readily connected to one another again. Furthermore, the end plate 11 constitutes a circular surface or area. In FIG. 4, which is a sectional view taken along the line IV--1V in FIG. 3 facing toward the inlet end of the cooling tube 1, the inventive disposition of the material inlet opening 15 in the end plate 11 is illustrated. As shown therein, the center 16 of the material inlet opening 15 is pivoted in the plane of the drawing through an angle a of between 15 and 45, for example, counterclockwise about the cooling tube axis 17 and with respect to a plane 19 determined by the axis of the rotary kiln and the axis 17 of the cooling tube, i.e., wherein both the rotary kiln axis and the cooling tube axis are disposed. The material inlet opening 15 is located largely in the half of the end plate 11 that is turned away from the wall of the rotary kiln.

The aforedescribed satellite cooler operates in the following manner: I

The burnt or roasted material present in the interior of the rotary kiln drops through the respective discharge openings 6 located below the axis of the kiln into the connecting chutes 3 and thus reaches, respectively, the inlet ends of the corresponding cooling tubes 1. The supply of material ceases as a consequence of the upward movement of the respective material discharge'opening 6 after is has traveled, respectively, through a predetermined rotary angle. Because the respective material discharge opening 6 associated with the particular cooling tube 1 is disposed in leading relationship with respect to the direction 'of rotation, part of the connecting chute 3 proper is still at an inclination when the respective material discharge opening I 6 is located in a positionabove the rotary kiln axis. As-

surance is thereby provided that the kiln material remaining in the connecting chute 3 completely reaches the cooling tube 1.

Because the material inlet opening 15, on the other hand, is largely located in the half of the end plate 11, that is, turned away from the casing of the rotary kiln, the edge of the material inlet opening 15, at a position of the rotary kiln in which the material supply from the connecting chute 3 has ceased, is already located above the surface of the material present in the cooling tube 1, so that the material is reliably prevented from dropping back into the rotary kiln.

As the kiln rotates, the wall 18 of the kinked part, in the aforedescribed embodiment of the invention having a kinked inlet end, slides under the charge of material in the vicinity of the inlet and effects, during the material supply phase, a powerful transporting movement in direction toward the outlet end of the cooling tube.

- When the respective cooling tube 1 reaches a position special construction of the inlet end, as early as during the material supply phase, a transport action is exerted in direction toward the outlet and continues with respect to one cooling tube substantially over threefourths of a rotation of the kiln. In this way, at the beginning of a new material supply phase, the inlet end of the respective cooling tube '1 is virtually completely emptied and, consequently, packing or damming the material within the connecting chutes 3 during the material supply phase is avoided.

The disposition of the material inlet opening 15 is the end plate 11, which is shown in FIG. 4, has an advantageous effect, because the slope or bank of material forming within the cooling tube 1 due to the rotation of the kiln, as shown in FIG. 4, does not yet cover the cross-section of the material inlet opening 15 when the material supply phase for the respective cooling tube 1 is instituted. In this manner, the material dropping out of the kiln travels deeply into the inlet region of the cooling tube 1.

The aforedescribed embodiment only represents a preferred construction of the satellite cooler according to the invention. The aforedescribed motion relationships and the special advantages are capable of attainment with a simplified construction wherein, instead of the kinking, the end plate 11 is already in a plane corresponding substantially to the severing plane 13, which is disposed at an angle [3, between 30 and with respect to the cooling tube axis 17.

I claim:

1. Satellite cooler comprising a plurality of cooling tubes distributable uniformly about the periphery of a rotary kiln at the material outlet end thereof, said cooling tubes being formed with respective material inlet openings connectible by respective rigid tubular connecting chutes to respective material discharge openings formed in the casing of the rotary kiln, said material discharge openings being offset in rotary direction of the kiln relative to said respective material inlet openings of said cooling tubes, each of said cooling tubes having a respective inlet end severed obliquely to the axis of therespective cooling tube so that the severing plane extends substantially vertically when the respective material discharge opening in the rotary kiln casing has attained substantially its lowest position beneath the rotary kiln axis and an end plate disposed in said severing plane and closing said cooling tube, said material inlet opening being formed in said end plate.

2. Satellite cooler according to claim 1 wherein each of said material inlet openings islocated with respect to the axis of the rotary kiln in a half of the respective end plate located more distant than the other half thereof from the rotary kiln casing.

3. Satellite cooler according to claim 1 wherein said severing plane in which said end plate is disposed has an angle of inclination B of from 30 to 70 with respect to the longitudinal axis of said cooling tube.

4. Satellite cooler according to claim 1 wherein each of said cooling tubes, in the region of said inlet end thereof, has a kinked construction in direction toward the respective material discharge opening of the rotary kiln, the location of said kink being in an imaginary plane which, as well as the plane wherein said end plate is disposed, extends substantially in vertical direction when the respective material discharge opening in the rotary kiln casing has reached the substantially lowest position thereof beneath the rotary kiln axis.

5. Satellite cooler according to claim 4 wherein said kink is formed by a part of the respective cooling tube comprising an end of the tube severed obliquely to the axis of the tube, said end plate being located at the end of the tube and extending perpendicularly to the original axis of the tube, said severed tube end being rotated through an angle of 180 and firmly reconnected at the severed surface thereof to the corresponding severed surface of the remainder of said cooling tube.

6. Satellite cooler according to claim 1 wherein the respective tubular connecting chutes at the end thereof connecting with the rotary kiln extend substantially in radial direction of the rotary kiln and, at the end thereof connecting with the respective cooling tube, extend substantially perpendicularly to the plane of said end plate.

7. Satellite cooler according to claim 1 wherein said material inlet opening has a center which is pivoted in a vertical plane through an angle a of between and 45 counterclockwise about the axis of the respective cooling tube and with respect to a plane in which both the axis of the rotary kiln and the axis of the respective cooling tube are disposed.

8. Satellite cooler according to claim 2 wherein said severing plane in which said end plate is disposed has an angle of inclination Bof from 30to 70 with respect to the longitudinal axis of said cooling tube.

9; Satellite cooler according to claim 3 wherein each of said cooling tubes, in the region of said inlet end thereof, has a kinked construction in direction toward the material discharge opening of the rotary-kiln, the location of said kink being in an imaginary plane which, as well as the plane wherein said end plate is disposed, extends substantially in vertical direction when the respective material discharge opening in the rotary kiln casing has reached the substantially lowest position thereof beneath the rotary kiln axis.

10. Satellite cooler according to claim 9 wherein said kink is formed by a part of the respective cooling tube comprising an end of the tube severed obliquely to the axis of the tube, said end plate being located at the end of the tube and extending perpendicularly to the original axis of the tube, said severed tube end being rotated through an angle of and firmly reconnected at the severed surface thereof to the corresponding severed surface of the remainder of said cooling tube.

1 1. Satellite cooler according to claim 10 wherein the respective tubular connecting chutes, at the end thereof connecting with the respective cooling tube, extend substantially perpendicularly to the plane of said end plate.

12. Satellitecooler according to claim 11 wherein said material inlet opening has a center which is pivot'ed in a vertical plane through an angle a of between 15 and 45 counterclockwise about the axis of the respective cooling tube and with respect to a plane in which both the axis of the rotary-kiln and the axis of the respective cooling tube are disposed. 

1. Satellite cooler comprising a plurality of cooling tubes distributable uniformly about the periphery of a rotary kiln at the material outlet end thereof, said cooling tubes being formed with respective material inlet openings connectible by respective rigid tubular connecting chutes to respective material discharge openings formed in the casing of the rotary kiln, said material discharge openings being offset in rotary direction of the kiln relative to said respective material inlet openings of said cooling tubes, each of said cooling tubes having a respective inlet end severed obliquely to the axis of the respective cooling tube so that the severing plane extends substantially vertically when the respective material discharge opening in the rotary kiln casing has attained substantially its lowest position beneath the rotary kiln axis and an end plate disposed in said severing plane and closing said cooling tube, said material inlet opening being formed in said end plate.
 2. Satellite cooler according to claim 1 wherein each of said material inlet openings is located with respect to the axis of the rotary kiln in a half of the respective end plate located more distant than the other half thereof from the rotary kiln casing.
 3. Satellite cooler according to claim 1 wherein said severing plane in which said end plate is disposed has an angle of inclination Beta of from 30* to 70* with respect to the longitudinal axis of said cooling tube.
 4. Satellite cooler according to claim 1 wherein each of said cooling tubes, in the region of said inlet end thereof, has a kinked construction in direction toward the respective material discharge opening of the rotary kiln, the location of said kink being in an imaginary plane which, as well as the plane wherein said end plate is disposed, extends substantially in vertical direction when the respective material discharge opening in the rotary kiln casing has reached the substantially lowest position thereof beneath the rotary kiln axis.
 5. Satellite cooler according to claim 4 wherein said kink is formed by a part of the respective cooling tube comprising an end of the tube severed obliquely to the axis of the tube, said end plate being located at the end of the tube and extending perpendicularly to the original axis of the tube, said severed tube end being rotated through an angle of 180* and firmly reconnected at the severed surface thereof to the corresponding severed surface of the remainder of said cooling tube.
 6. Satellite cooler according to claim 1 wherein the respective tubular connecting chutes, at the end thereof connecting with the rotary kiln extend substantially in radial direction of the rotary kiln and, at the end thereof connecting with the respective cooling tube, extend substantially perpendicularly to the plane of said end plate.
 7. Satellite coolEr according to claim 1 wherein said material inlet opening has a center which is pivoted in a vertical plane through an angle Alpha of between 15* and 45* counterclockwise about the axis of the respective cooling tube and with respect to a plane in which both the axis of the rotary kiln and the axis of the respective cooling tube are disposed.
 8. Satellite cooler according to claim 2 wherein said severing plane in which said end plate is disposed has an angle of inclination Beta of from 30* to 70* with respect to the longitudinal axis of said cooling tube.
 9. Satellite cooler according to claim 3 wherein each of said cooling tubes, in the region of said inlet end thereof, has a kinked construction in direction toward the material discharge opening of the rotary kiln, the location of said kink being in an imaginary plane which, as well as the plane wherein said end plate is disposed, extends substantially in vertical direction when the respective material discharge opening in the rotary kiln casing has reached the substantially lowest position thereof beneath the rotary kiln axis.
 10. Satellite cooler according to claim 9 wherein said kink is formed by a part of the respective cooling tube comprising an end of the tube severed obliquely to the axis of the tube, said end plate being located at the end of the tube and extending perpendicularly to the original axis of the tube, said severed tube end being rotated through an angle of 180* and firmly reconnected at the severed surface thereof to the corresponding severed surface of the remainder of said cooling tube.
 11. Satellite cooler according to claim 10 wherein the respective tubular connecting chutes, at the end thereof connecting with the respective cooling tube, extend substantially perpendicularly to the plane of said end plate.
 12. Satellite cooler according to claim 11 wherein said material inlet opening has a center which is pivoted in a vertical plane through an angle Alpha of between 15* and 45* counterclockwise about the axis of the respective cooling tube and with respect to a plane in which both the axis of the rotary kiln and the axis of the respective cooling tube are disposed. 